Empirical Direction in Design and Analysis

By Norman H. Anderson | Go to book overview

Chapter 9
REGRESSION AND CORRELATION

Prediction is a strong point of regression analysis, already illustrated with prediction of success in graduate school in Section 1.5.1 (page 25). Regression analysis has valuable capability to utilize observational data, as in this example, not requiring experimental control. Multiple predictor variables can be teamed for better results with little more trouble than a single predictor. This simplicity contrasts with factorial Anova, in which each added variable expands the bulkiness of the factorial design. This usefulness of regression analysis reflects the empirical prevalence of linear trends with quantitative, metric variables.

With experimentally controlled variables, regression analysis can also be useful. Many experimental variables are metric: amount of reward, concentration of drug, length of word list, time intervals, and so forth. By utilizing the stimulus metric, regression can extract more information than factorial Anova. Simpler, nonfactorial designs also become feasible.

For causal analysis with observational data, regression has limited usefulness. A number of health problems, for example, have been traced back to their causes using observational data. Such results are more commonly presented as correlations, derived from the regression. Causal analysis is a weak point of regression with observational data, however, as shown by the well-known pitfalls of correlation.


9.1 ONE-VARIABLE REGRESSION

In one-variable regression, the data come in the form of Y–X pairs, one pair for each subject: Y is the response measure; X is the predictor measure. Thus, X might be grade point average in college, and Y success in graduate school. The problem is to find a formula that uses information in X to predict Y.

-259-

Notes for this page

Add a new note
If you are trying to select text to create highlights or citations, remember that you must now click or tap on the first word, and then click or tap on the last word.
One moment ...
Project items

Items saved from this book

This book has been saved
Highlights (0)
Some of your highlights are legacy items.

Highlights saved before July 30, 2012 will not be displayed on their respective source pages.

You can easily re-create the highlights by opening the book page or article, selecting the text, and clicking “Highlight.”

Citations (0)
Some of your citations are legacy items.

Any citation created before July 30, 2012 will labeled as a “Cited page.” New citations will be saved as cited passages, pages or articles.

We also added the ability to view new citations from your projects or the book or article where you created them.

Notes (0)
Bookmarks (0)

You have no saved items from this book

Project items include:
  • Saved book/article
  • Highlights
  • Quotes/citations
  • Notes
  • Bookmarks
Notes
Cite this page

Cited page

Style
Citations are available only to our active members.
Sign up now to cite pages or passages in MLA, APA and Chicago citation styles.

(Einhorn, 1992, p. 25)

(Einhorn 25)

1

1. Lois J. Einhorn, Abraham Lincoln, the Orator: Penetrating the Lincoln Legend (Westport, CT: Greenwood Press, 1992), 25, http://www.questia.com/read/27419298.

Cited page

Bookmark this page
Empirical Direction in Design and Analysis
Table of contents

Table of contents

Settings

Settings

Typeface
Text size Smaller Larger
Search within

Search within this book

Look up

Look up a word

  • Dictionary
  • Thesaurus
Please submit a word or phrase above.
Print this page

Print this page

Why can't I print more than one page at a time?

Full screen
/ 864

matching results for page

Cited passage

Style
Citations are available only to our active members.
Sign up now to cite pages or passages in MLA, APA and Chicago citation styles.

"Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn, 1992, p. 25).

"Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn 25)

"Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences."1

1. Lois J. Einhorn, Abraham Lincoln, the Orator: Penetrating the Lincoln Legend (Westport, CT: Greenwood Press, 1992), 25, http://www.questia.com/read/27419298.

Cited passage

Welcome to the new Questia Reader

The Questia Reader has been updated to provide you with an even better online reading experience.  It is now 100% Responsive, which means you can read our books and articles on any sized device you wish.  All of your favorite tools like notes, highlights, and citations are still here, but the way you select text has been updated to be easier to use, especially on touchscreen devices.  Here's how:

1. Click or tap the first word you want to select.
2. Click or tap the last word you want to select.

OK, got it!

Thanks for trying Questia!

Please continue trying out our research tools, but please note, full functionality is available only to our active members.

Your work will be lost once you leave this Web page.

For full access in an ad-free environment, sign up now for a FREE, 1-day trial.

Already a member? Log in now.